The Keyence AP-31KP Negative Pressure Sensor is a high-performance main unit designed to provide reliable and accurate vacuum pressure measurement in demanding industrial applications. Built for PNP output configurations, this model is ideal for integration into automation systems where consistent monitoring of suction or vacuum levels is required.

The AP-31KP supports a rated pressure range of 0 to -101.3 kPa (0 to -29.9 inHg), with a detection resolution as fine as 0.1 kPa, 0.1 inHg, 1 mmHg, or 0.001 bar, depending on display mode. This precision makes it suitable for processes such as suction confirmation in robotic pick-and-place systems, vacuum packaging, leak testing, and other applications requiring exact pressure control. Its detectable pressure range of -15 to +110% of F.S. ensures measurement accuracy even under slight over-pressurization or environmental fluctuation.

A standout feature is the chattering prevention function, which provides selectable response times of 2.5 ms, 5 ms, 100 ms, or 500 ms. This flexibility allows operators to prioritize ultra-fast detection in high-speed automation lines or stable filtering in environments with vibration or fluctuating pressures. By balancing speed and stability, the AP-31KP delivers dependable output under varying conditions.

The unit offers dual PNP open-collector outputs rated at 100 mA (30 V max.) with N.O./N.C. selectability, enabling flexible use for alarms, triggers, or process controls. An additional analog output (1–5 V, 47 kΩ load minimum) allows smooth integration into analog monitoring or feedback systems, ensuring compatibility with a wide range of PLCs and control devices.

Built for durability, the AP-31KP withstands pressure resistance up to 72.5 PSI, with an operating temperature range of 0 to +50 °C and humidity tolerance of 35–85% RH. Its housing materials include polyamide and polysulfone, with a PET front panel sheet for long-term visibility and an oil-proof cabtyre cable for industrial reliability. Vibration resistance of 10 to 55 Hz at 1.5 mm double amplitude and shock resistance in all three axes ensure consistent performance even in harsh factory conditions.

Weighing just 120 g, the AP-31KP is compact and lightweight, making it simple to mount in control panels or directly on equipment. Its 3 ½-digit dual-color LED display (character height 11 mm) provides clear readings with color-coded visual feedback, enhancing operator usability.

In summary, the Keyence AP-31KP combines precision measurement, high-speed adaptability, versatile outputs, and rugged durability into a compact, user-friendly package. It is ideally suited for applications in vacuum handling, packaging machinery, robotics, leak detection, and process monitoring, where accurate negative pressure measurement is essential for efficiency and quality.